1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ov2685 driver
4 *
5 * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
6 */
7
8 #include <linux/clk.h>
9 #include <linux/device.h>
10 #include <linux/delay.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/i2c.h>
13 #include <linux/module.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/sysfs.h>
17 #include <media/media-entity.h>
18 #include <media/v4l2-async.h>
19 #include <media/v4l2-ctrls.h>
20 #include <media/v4l2-subdev.h>
21
22 #define CHIP_ID 0x2685
23 #define OV2685_REG_CHIP_ID 0x300a
24
25 #define OV2685_XVCLK_FREQ 24000000
26
27 #define REG_SC_CTRL_MODE 0x0100
28 #define SC_CTRL_MODE_STANDBY 0x0
29 #define SC_CTRL_MODE_STREAMING BIT(0)
30
31 #define OV2685_REG_EXPOSURE 0x3500
32 #define OV2685_EXPOSURE_MIN 4
33 #define OV2685_EXPOSURE_STEP 1
34
35 #define OV2685_REG_VTS 0x380e
36 #define OV2685_VTS_MAX 0x7fff
37
38 #define OV2685_REG_GAIN 0x350a
39 #define OV2685_GAIN_MIN 0
40 #define OV2685_GAIN_MAX 0x07ff
41 #define OV2685_GAIN_STEP 0x1
42 #define OV2685_GAIN_DEFAULT 0x0036
43
44 #define OV2685_REG_TEST_PATTERN 0x5080
45 #define OV2685_TEST_PATTERN_DISABLED 0x00
46 #define OV2685_TEST_PATTERN_COLOR_BAR 0x80
47 #define OV2685_TEST_PATTERN_RANDOM 0x81
48 #define OV2685_TEST_PATTERN_COLOR_BAR_FADE 0x88
49 #define OV2685_TEST_PATTERN_BW_SQUARE 0x92
50 #define OV2685_TEST_PATTERN_COLOR_SQUARE 0x82
51
52 #define REG_NULL 0xFFFF
53
54 #define OV2685_REG_VALUE_08BIT 1
55 #define OV2685_REG_VALUE_16BIT 2
56 #define OV2685_REG_VALUE_24BIT 3
57
58 #define OV2685_LANES 1
59 #define OV2685_BITS_PER_SAMPLE 10
60
61 static const char * const ov2685_supply_names[] = {
62 "avdd", /* Analog power */
63 "dovdd", /* Digital I/O power */
64 "dvdd", /* Digital core power */
65 };
66
67 #define OV2685_NUM_SUPPLIES ARRAY_SIZE(ov2685_supply_names)
68
69 struct regval {
70 u16 addr;
71 u8 val;
72 };
73
74 struct ov2685_mode {
75 u32 width;
76 u32 height;
77 u32 exp_def;
78 u32 hts_def;
79 u32 vts_def;
80 const struct regval *reg_list;
81 };
82
83 struct ov2685 {
84 struct i2c_client *client;
85 struct clk *xvclk;
86 struct gpio_desc *reset_gpio;
87 struct regulator_bulk_data supplies[OV2685_NUM_SUPPLIES];
88
89 bool streaming;
90 struct mutex mutex;
91 struct v4l2_subdev subdev;
92 struct media_pad pad;
93 struct v4l2_ctrl *anal_gain;
94 struct v4l2_ctrl *exposure;
95 struct v4l2_ctrl *hblank;
96 struct v4l2_ctrl *vblank;
97 struct v4l2_ctrl *test_pattern;
98 struct v4l2_ctrl_handler ctrl_handler;
99
100 const struct ov2685_mode *cur_mode;
101 };
102
103 #define to_ov2685(sd) container_of(sd, struct ov2685, subdev)
104
105 /* PLL settings bases on 24M xvclk */
106 static struct regval ov2685_1600x1200_regs[] = {
107 {0x0103, 0x01},
108 {0x0100, 0x00},
109 {0x3002, 0x00},
110 {0x3016, 0x1c},
111 {0x3018, 0x44},
112 {0x301d, 0xf0},
113 {0x3020, 0x00},
114 {0x3082, 0x37},
115 {0x3083, 0x03},
116 {0x3084, 0x09},
117 {0x3085, 0x04},
118 {0x3086, 0x00},
119 {0x3087, 0x00},
120 {0x3501, 0x4e},
121 {0x3502, 0xe0},
122 {0x3503, 0x27},
123 {0x350b, 0x36},
124 {0x3600, 0xb4},
125 {0x3603, 0x35},
126 {0x3604, 0x24},
127 {0x3605, 0x00},
128 {0x3620, 0x24},
129 {0x3621, 0x34},
130 {0x3622, 0x03},
131 {0x3628, 0x10},
132 {0x3705, 0x3c},
133 {0x370a, 0x21},
134 {0x370c, 0x50},
135 {0x370d, 0xc0},
136 {0x3717, 0x58},
137 {0x3718, 0x80},
138 {0x3720, 0x00},
139 {0x3721, 0x09},
140 {0x3722, 0x06},
141 {0x3723, 0x59},
142 {0x3738, 0x99},
143 {0x3781, 0x80},
144 {0x3784, 0x0c},
145 {0x3789, 0x60},
146 {0x3800, 0x00},
147 {0x3801, 0x00},
148 {0x3802, 0x00},
149 {0x3803, 0x00},
150 {0x3804, 0x06},
151 {0x3805, 0x4f},
152 {0x3806, 0x04},
153 {0x3807, 0xbf},
154 {0x3808, 0x06},
155 {0x3809, 0x40},
156 {0x380a, 0x04},
157 {0x380b, 0xb0},
158 {0x380c, 0x06},
159 {0x380d, 0xa4},
160 {0x380e, 0x05},
161 {0x380f, 0x0e},
162 {0x3810, 0x00},
163 {0x3811, 0x08},
164 {0x3812, 0x00},
165 {0x3813, 0x08},
166 {0x3814, 0x11},
167 {0x3815, 0x11},
168 {0x3819, 0x04},
169 {0x3820, 0xc0},
170 {0x3821, 0x00},
171 {0x3a06, 0x01},
172 {0x3a07, 0x84},
173 {0x3a08, 0x01},
174 {0x3a09, 0x43},
175 {0x3a0a, 0x24},
176 {0x3a0b, 0x60},
177 {0x3a0c, 0x28},
178 {0x3a0d, 0x60},
179 {0x3a0e, 0x04},
180 {0x3a0f, 0x8c},
181 {0x3a10, 0x05},
182 {0x3a11, 0x0c},
183 {0x4000, 0x81},
184 {0x4001, 0x40},
185 {0x4008, 0x02},
186 {0x4009, 0x09},
187 {0x4300, 0x00},
188 {0x430e, 0x00},
189 {0x4602, 0x02},
190 {0x481b, 0x40},
191 {0x481f, 0x40},
192 {0x4837, 0x18},
193 {0x5000, 0x1f},
194 {0x5001, 0x05},
195 {0x5002, 0x30},
196 {0x5003, 0x04},
197 {0x5004, 0x00},
198 {0x5005, 0x0c},
199 {0x5280, 0x15},
200 {0x5281, 0x06},
201 {0x5282, 0x06},
202 {0x5283, 0x08},
203 {0x5284, 0x1c},
204 {0x5285, 0x1c},
205 {0x5286, 0x20},
206 {0x5287, 0x10},
207 {REG_NULL, 0x00}
208 };
209
210 #define OV2685_LINK_FREQ_330MHZ 330000000
211 static const s64 link_freq_menu_items[] = {
212 OV2685_LINK_FREQ_330MHZ
213 };
214
215 static const char * const ov2685_test_pattern_menu[] = {
216 "Disabled",
217 "Color Bar",
218 "Color Bar FADE",
219 "Random Data",
220 "Black White Square",
221 "Color Square"
222 };
223
224 static const int ov2685_test_pattern_val[] = {
225 OV2685_TEST_PATTERN_DISABLED,
226 OV2685_TEST_PATTERN_COLOR_BAR,
227 OV2685_TEST_PATTERN_COLOR_BAR_FADE,
228 OV2685_TEST_PATTERN_RANDOM,
229 OV2685_TEST_PATTERN_BW_SQUARE,
230 OV2685_TEST_PATTERN_COLOR_SQUARE,
231 };
232
233 static const struct ov2685_mode supported_modes[] = {
234 {
235 .width = 1600,
236 .height = 1200,
237 .exp_def = 0x04ee,
238 .hts_def = 0x06a4,
239 .vts_def = 0x050e,
240 .reg_list = ov2685_1600x1200_regs,
241 },
242 };
243
244 /* Write registers up to 4 at a time */
ov2685_write_reg(struct i2c_client * client,u16 reg,u32 len,u32 val)245 static int ov2685_write_reg(struct i2c_client *client, u16 reg,
246 u32 len, u32 val)
247 {
248 u32 val_i, buf_i;
249 u8 buf[6];
250 u8 *val_p;
251 __be32 val_be;
252
253 if (len > 4)
254 return -EINVAL;
255
256 buf[0] = reg >> 8;
257 buf[1] = reg & 0xff;
258
259 val_be = cpu_to_be32(val);
260 val_p = (u8 *)&val_be;
261 buf_i = 2;
262 val_i = 4 - len;
263
264 while (val_i < 4)
265 buf[buf_i++] = val_p[val_i++];
266
267 if (i2c_master_send(client, buf, len + 2) != len + 2)
268 return -EIO;
269
270 return 0;
271 }
272
ov2685_write_array(struct i2c_client * client,const struct regval * regs)273 static int ov2685_write_array(struct i2c_client *client,
274 const struct regval *regs)
275 {
276 int ret = 0;
277 u32 i;
278
279 for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
280 ret = ov2685_write_reg(client, regs[i].addr,
281 OV2685_REG_VALUE_08BIT, regs[i].val);
282
283 return ret;
284 }
285
286 /* Read registers up to 4 at a time */
ov2685_read_reg(struct i2c_client * client,u16 reg,u32 len,u32 * val)287 static int ov2685_read_reg(struct i2c_client *client, u16 reg,
288 u32 len, u32 *val)
289 {
290 struct i2c_msg msgs[2];
291 u8 *data_be_p;
292 __be32 data_be = 0;
293 __be16 reg_addr_be = cpu_to_be16(reg);
294 int ret;
295
296 if (len > 4)
297 return -EINVAL;
298
299 data_be_p = (u8 *)&data_be;
300 /* Write register address */
301 msgs[0].addr = client->addr;
302 msgs[0].flags = 0;
303 msgs[0].len = 2;
304 msgs[0].buf = (u8 *)®_addr_be;
305
306 /* Read data from register */
307 msgs[1].addr = client->addr;
308 msgs[1].flags = I2C_M_RD;
309 msgs[1].len = len;
310 msgs[1].buf = &data_be_p[4 - len];
311
312 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
313 if (ret != ARRAY_SIZE(msgs))
314 return -EIO;
315
316 *val = be32_to_cpu(data_be);
317
318 return 0;
319 }
320
ov2685_fill_fmt(const struct ov2685_mode * mode,struct v4l2_mbus_framefmt * fmt)321 static void ov2685_fill_fmt(const struct ov2685_mode *mode,
322 struct v4l2_mbus_framefmt *fmt)
323 {
324 fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
325 fmt->width = mode->width;
326 fmt->height = mode->height;
327 fmt->field = V4L2_FIELD_NONE;
328 }
329
ov2685_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)330 static int ov2685_set_fmt(struct v4l2_subdev *sd,
331 struct v4l2_subdev_pad_config *cfg,
332 struct v4l2_subdev_format *fmt)
333 {
334 struct ov2685 *ov2685 = to_ov2685(sd);
335 struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
336
337 /* only one mode supported for now */
338 ov2685_fill_fmt(ov2685->cur_mode, mbus_fmt);
339
340 return 0;
341 }
342
ov2685_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)343 static int ov2685_get_fmt(struct v4l2_subdev *sd,
344 struct v4l2_subdev_pad_config *cfg,
345 struct v4l2_subdev_format *fmt)
346 {
347 struct ov2685 *ov2685 = to_ov2685(sd);
348 struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
349
350 ov2685_fill_fmt(ov2685->cur_mode, mbus_fmt);
351
352 return 0;
353 }
354
ov2685_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)355 static int ov2685_enum_mbus_code(struct v4l2_subdev *sd,
356 struct v4l2_subdev_pad_config *cfg,
357 struct v4l2_subdev_mbus_code_enum *code)
358 {
359 if (code->index >= ARRAY_SIZE(supported_modes))
360 return -EINVAL;
361
362 code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
363
364 return 0;
365 }
366
ov2685_enum_frame_sizes(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)367 static int ov2685_enum_frame_sizes(struct v4l2_subdev *sd,
368 struct v4l2_subdev_pad_config *cfg,
369 struct v4l2_subdev_frame_size_enum *fse)
370 {
371 int index = fse->index;
372
373 if (index >= ARRAY_SIZE(supported_modes))
374 return -EINVAL;
375
376 fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
377
378 fse->min_width = supported_modes[index].width;
379 fse->max_width = supported_modes[index].width;
380 fse->max_height = supported_modes[index].height;
381 fse->min_height = supported_modes[index].height;
382
383 return 0;
384 }
385
386 /* Calculate the delay in us by clock rate and clock cycles */
ov2685_cal_delay(u32 cycles)387 static inline u32 ov2685_cal_delay(u32 cycles)
388 {
389 return DIV_ROUND_UP(cycles, OV2685_XVCLK_FREQ / 1000 / 1000);
390 }
391
__ov2685_power_on(struct ov2685 * ov2685)392 static int __ov2685_power_on(struct ov2685 *ov2685)
393 {
394 int ret;
395 u32 delay_us;
396 struct device *dev = &ov2685->client->dev;
397
398 ret = clk_prepare_enable(ov2685->xvclk);
399 if (ret < 0) {
400 dev_err(dev, "Failed to enable xvclk\n");
401 return ret;
402 }
403
404 gpiod_set_value_cansleep(ov2685->reset_gpio, 1);
405
406 ret = regulator_bulk_enable(OV2685_NUM_SUPPLIES, ov2685->supplies);
407 if (ret < 0) {
408 dev_err(dev, "Failed to enable regulators\n");
409 goto disable_clk;
410 }
411
412 /* The minimum delay between power supplies and reset rising can be 0 */
413 gpiod_set_value_cansleep(ov2685->reset_gpio, 0);
414 /* 8192 xvclk cycles prior to the first SCCB transaction */
415 delay_us = ov2685_cal_delay(8192);
416 usleep_range(delay_us, delay_us * 2);
417
418 /* HACK: ov2685 would output messy data after reset(R0103),
419 * writing register before .s_stream() as a workaround
420 */
421 ret = ov2685_write_array(ov2685->client, ov2685->cur_mode->reg_list);
422 if (ret)
423 goto disable_supplies;
424
425 return 0;
426
427 disable_supplies:
428 regulator_bulk_disable(OV2685_NUM_SUPPLIES, ov2685->supplies);
429 disable_clk:
430 clk_disable_unprepare(ov2685->xvclk);
431
432 return ret;
433 }
434
__ov2685_power_off(struct ov2685 * ov2685)435 static void __ov2685_power_off(struct ov2685 *ov2685)
436 {
437 /* 512 xvclk cycles after the last SCCB transaction or MIPI frame end */
438 u32 delay_us = ov2685_cal_delay(512);
439
440 usleep_range(delay_us, delay_us * 2);
441 clk_disable_unprepare(ov2685->xvclk);
442 gpiod_set_value_cansleep(ov2685->reset_gpio, 1);
443 regulator_bulk_disable(OV2685_NUM_SUPPLIES, ov2685->supplies);
444 }
445
ov2685_s_stream(struct v4l2_subdev * sd,int on)446 static int ov2685_s_stream(struct v4l2_subdev *sd, int on)
447 {
448 struct ov2685 *ov2685 = to_ov2685(sd);
449 struct i2c_client *client = ov2685->client;
450 int ret = 0;
451
452 mutex_lock(&ov2685->mutex);
453
454 on = !!on;
455 if (on == ov2685->streaming)
456 goto unlock_and_return;
457
458 if (on) {
459 ret = pm_runtime_get_sync(&ov2685->client->dev);
460 if (ret < 0) {
461 pm_runtime_put_noidle(&client->dev);
462 goto unlock_and_return;
463 }
464 ret = __v4l2_ctrl_handler_setup(&ov2685->ctrl_handler);
465 if (ret) {
466 pm_runtime_put(&client->dev);
467 goto unlock_and_return;
468 }
469 ret = ov2685_write_reg(client, REG_SC_CTRL_MODE,
470 OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STREAMING);
471 if (ret) {
472 pm_runtime_put(&client->dev);
473 goto unlock_and_return;
474 }
475 } else {
476 ov2685_write_reg(client, REG_SC_CTRL_MODE,
477 OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STANDBY);
478 pm_runtime_put(&ov2685->client->dev);
479 }
480
481 ov2685->streaming = on;
482
483 unlock_and_return:
484 mutex_unlock(&ov2685->mutex);
485
486 return ret;
487 }
488
489 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
ov2685_open(struct v4l2_subdev * sd,struct v4l2_subdev_fh * fh)490 static int ov2685_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
491 {
492 struct ov2685 *ov2685 = to_ov2685(sd);
493 struct v4l2_mbus_framefmt *try_fmt;
494
495 mutex_lock(&ov2685->mutex);
496
497 try_fmt = v4l2_subdev_get_try_format(sd, fh->pad, 0);
498 /* Initialize try_fmt */
499 ov2685_fill_fmt(&supported_modes[0], try_fmt);
500
501 mutex_unlock(&ov2685->mutex);
502
503 return 0;
504 }
505 #endif
506
ov2685_runtime_resume(struct device * dev)507 static int __maybe_unused ov2685_runtime_resume(struct device *dev)
508 {
509 struct i2c_client *client = to_i2c_client(dev);
510 struct v4l2_subdev *sd = i2c_get_clientdata(client);
511 struct ov2685 *ov2685 = to_ov2685(sd);
512
513 return __ov2685_power_on(ov2685);
514 }
515
ov2685_runtime_suspend(struct device * dev)516 static int __maybe_unused ov2685_runtime_suspend(struct device *dev)
517 {
518 struct i2c_client *client = to_i2c_client(dev);
519 struct v4l2_subdev *sd = i2c_get_clientdata(client);
520 struct ov2685 *ov2685 = to_ov2685(sd);
521
522 __ov2685_power_off(ov2685);
523
524 return 0;
525 }
526
527 static const struct dev_pm_ops ov2685_pm_ops = {
528 SET_RUNTIME_PM_OPS(ov2685_runtime_suspend,
529 ov2685_runtime_resume, NULL)
530 };
531
ov2685_set_ctrl(struct v4l2_ctrl * ctrl)532 static int ov2685_set_ctrl(struct v4l2_ctrl *ctrl)
533 {
534 struct ov2685 *ov2685 = container_of(ctrl->handler,
535 struct ov2685, ctrl_handler);
536 struct i2c_client *client = ov2685->client;
537 s64 max_expo;
538 int ret;
539
540 /* Propagate change of current control to all related controls */
541 switch (ctrl->id) {
542 case V4L2_CID_VBLANK:
543 /* Update max exposure while meeting expected vblanking */
544 max_expo = ov2685->cur_mode->height + ctrl->val - 4;
545 __v4l2_ctrl_modify_range(ov2685->exposure,
546 ov2685->exposure->minimum, max_expo,
547 ov2685->exposure->step,
548 ov2685->exposure->default_value);
549 break;
550 }
551
552 if (pm_runtime_get_if_in_use(&client->dev) <= 0)
553 return 0;
554
555 switch (ctrl->id) {
556 case V4L2_CID_EXPOSURE:
557 ret = ov2685_write_reg(ov2685->client, OV2685_REG_EXPOSURE,
558 OV2685_REG_VALUE_24BIT, ctrl->val << 4);
559 break;
560 case V4L2_CID_ANALOGUE_GAIN:
561 ret = ov2685_write_reg(ov2685->client, OV2685_REG_GAIN,
562 OV2685_REG_VALUE_16BIT, ctrl->val);
563 break;
564 case V4L2_CID_VBLANK:
565 ret = ov2685_write_reg(ov2685->client, OV2685_REG_VTS,
566 OV2685_REG_VALUE_16BIT,
567 ctrl->val + ov2685->cur_mode->height);
568 break;
569 case V4L2_CID_TEST_PATTERN:
570 ret = ov2685_write_reg(ov2685->client, OV2685_REG_TEST_PATTERN,
571 OV2685_REG_VALUE_08BIT,
572 ov2685_test_pattern_val[ctrl->val]);
573 break;
574 default:
575 dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
576 __func__, ctrl->id, ctrl->val);
577 ret = -EINVAL;
578 break;
579 };
580
581 pm_runtime_put(&client->dev);
582
583 return ret;
584 }
585
586 static const struct v4l2_subdev_video_ops ov2685_video_ops = {
587 .s_stream = ov2685_s_stream,
588 };
589
590 static const struct v4l2_subdev_pad_ops ov2685_pad_ops = {
591 .enum_mbus_code = ov2685_enum_mbus_code,
592 .enum_frame_size = ov2685_enum_frame_sizes,
593 .get_fmt = ov2685_get_fmt,
594 .set_fmt = ov2685_set_fmt,
595 };
596
597 static const struct v4l2_subdev_ops ov2685_subdev_ops = {
598 .video = &ov2685_video_ops,
599 .pad = &ov2685_pad_ops,
600 };
601
602 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
603 static const struct v4l2_subdev_internal_ops ov2685_internal_ops = {
604 .open = ov2685_open,
605 };
606 #endif
607
608 static const struct v4l2_ctrl_ops ov2685_ctrl_ops = {
609 .s_ctrl = ov2685_set_ctrl,
610 };
611
ov2685_initialize_controls(struct ov2685 * ov2685)612 static int ov2685_initialize_controls(struct ov2685 *ov2685)
613 {
614 const struct ov2685_mode *mode;
615 struct v4l2_ctrl_handler *handler;
616 struct v4l2_ctrl *ctrl;
617 u64 exposure_max;
618 u32 pixel_rate, h_blank;
619 int ret;
620
621 handler = &ov2685->ctrl_handler;
622 mode = ov2685->cur_mode;
623 ret = v4l2_ctrl_handler_init(handler, 8);
624 if (ret)
625 return ret;
626 handler->lock = &ov2685->mutex;
627
628 ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
629 0, 0, link_freq_menu_items);
630 if (ctrl)
631 ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
632
633 pixel_rate = (link_freq_menu_items[0] * 2 * OV2685_LANES) /
634 OV2685_BITS_PER_SAMPLE;
635 v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
636 0, pixel_rate, 1, pixel_rate);
637
638 h_blank = mode->hts_def - mode->width;
639 ov2685->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
640 h_blank, h_blank, 1, h_blank);
641 if (ov2685->hblank)
642 ov2685->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
643
644 ov2685->vblank = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
645 V4L2_CID_VBLANK, mode->vts_def - mode->height,
646 OV2685_VTS_MAX - mode->height, 1,
647 mode->vts_def - mode->height);
648
649 exposure_max = mode->vts_def - 4;
650 ov2685->exposure = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
651 V4L2_CID_EXPOSURE, OV2685_EXPOSURE_MIN,
652 exposure_max, OV2685_EXPOSURE_STEP,
653 mode->exp_def);
654
655 ov2685->anal_gain = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
656 V4L2_CID_ANALOGUE_GAIN, OV2685_GAIN_MIN,
657 OV2685_GAIN_MAX, OV2685_GAIN_STEP,
658 OV2685_GAIN_DEFAULT);
659
660 ov2685->test_pattern = v4l2_ctrl_new_std_menu_items(handler,
661 &ov2685_ctrl_ops, V4L2_CID_TEST_PATTERN,
662 ARRAY_SIZE(ov2685_test_pattern_menu) - 1,
663 0, 0, ov2685_test_pattern_menu);
664
665 if (handler->error) {
666 ret = handler->error;
667 dev_err(&ov2685->client->dev,
668 "Failed to init controls(%d)\n", ret);
669 goto err_free_handler;
670 }
671
672 ov2685->subdev.ctrl_handler = handler;
673
674 return 0;
675
676 err_free_handler:
677 v4l2_ctrl_handler_free(handler);
678
679 return ret;
680 }
681
ov2685_check_sensor_id(struct ov2685 * ov2685,struct i2c_client * client)682 static int ov2685_check_sensor_id(struct ov2685 *ov2685,
683 struct i2c_client *client)
684 {
685 struct device *dev = &ov2685->client->dev;
686 int ret;
687 u32 id = 0;
688
689 ret = ov2685_read_reg(client, OV2685_REG_CHIP_ID,
690 OV2685_REG_VALUE_16BIT, &id);
691 if (id != CHIP_ID) {
692 dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n", id, ret);
693 return ret;
694 }
695
696 dev_info(dev, "Detected OV%04x sensor\n", CHIP_ID);
697
698 return 0;
699 }
700
ov2685_configure_regulators(struct ov2685 * ov2685)701 static int ov2685_configure_regulators(struct ov2685 *ov2685)
702 {
703 int i;
704
705 for (i = 0; i < OV2685_NUM_SUPPLIES; i++)
706 ov2685->supplies[i].supply = ov2685_supply_names[i];
707
708 return devm_regulator_bulk_get(&ov2685->client->dev,
709 OV2685_NUM_SUPPLIES,
710 ov2685->supplies);
711 }
712
ov2685_probe(struct i2c_client * client,const struct i2c_device_id * id)713 static int ov2685_probe(struct i2c_client *client,
714 const struct i2c_device_id *id)
715 {
716 struct device *dev = &client->dev;
717 struct ov2685 *ov2685;
718 int ret;
719
720 ov2685 = devm_kzalloc(dev, sizeof(*ov2685), GFP_KERNEL);
721 if (!ov2685)
722 return -ENOMEM;
723
724 ov2685->client = client;
725 ov2685->cur_mode = &supported_modes[0];
726
727 ov2685->xvclk = devm_clk_get(dev, "xvclk");
728 if (IS_ERR(ov2685->xvclk)) {
729 dev_err(dev, "Failed to get xvclk\n");
730 return -EINVAL;
731 }
732 ret = clk_set_rate(ov2685->xvclk, OV2685_XVCLK_FREQ);
733 if (ret < 0) {
734 dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
735 return ret;
736 }
737 if (clk_get_rate(ov2685->xvclk) != OV2685_XVCLK_FREQ)
738 dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
739
740 ov2685->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
741 if (IS_ERR(ov2685->reset_gpio)) {
742 dev_err(dev, "Failed to get reset-gpios\n");
743 return -EINVAL;
744 }
745
746 ret = ov2685_configure_regulators(ov2685);
747 if (ret) {
748 dev_err(dev, "Failed to get power regulators\n");
749 return ret;
750 }
751
752 mutex_init(&ov2685->mutex);
753 v4l2_i2c_subdev_init(&ov2685->subdev, client, &ov2685_subdev_ops);
754 ret = ov2685_initialize_controls(ov2685);
755 if (ret)
756 goto err_destroy_mutex;
757
758 ret = __ov2685_power_on(ov2685);
759 if (ret)
760 goto err_free_handler;
761
762 ret = ov2685_check_sensor_id(ov2685, client);
763 if (ret)
764 goto err_power_off;
765
766 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
767 ov2685->subdev.internal_ops = &ov2685_internal_ops;
768 ov2685->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
769 #endif
770 #if defined(CONFIG_MEDIA_CONTROLLER)
771 ov2685->pad.flags = MEDIA_PAD_FL_SOURCE;
772 ov2685->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
773 ret = media_entity_pads_init(&ov2685->subdev.entity, 1, &ov2685->pad);
774 if (ret < 0)
775 goto err_power_off;
776 #endif
777
778 ret = v4l2_async_register_subdev(&ov2685->subdev);
779 if (ret) {
780 dev_err(dev, "v4l2 async register subdev failed\n");
781 goto err_clean_entity;
782 }
783
784 pm_runtime_set_active(dev);
785 pm_runtime_enable(dev);
786 pm_runtime_idle(dev);
787
788 return 0;
789
790 err_clean_entity:
791 #if defined(CONFIG_MEDIA_CONTROLLER)
792 media_entity_cleanup(&ov2685->subdev.entity);
793 #endif
794 err_power_off:
795 __ov2685_power_off(ov2685);
796 err_free_handler:
797 v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
798 err_destroy_mutex:
799 mutex_destroy(&ov2685->mutex);
800
801 return ret;
802 }
803
ov2685_remove(struct i2c_client * client)804 static int ov2685_remove(struct i2c_client *client)
805 {
806 struct v4l2_subdev *sd = i2c_get_clientdata(client);
807 struct ov2685 *ov2685 = to_ov2685(sd);
808
809 v4l2_async_unregister_subdev(sd);
810 #if defined(CONFIG_MEDIA_CONTROLLER)
811 media_entity_cleanup(&sd->entity);
812 #endif
813 v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
814 mutex_destroy(&ov2685->mutex);
815
816 pm_runtime_disable(&client->dev);
817 if (!pm_runtime_status_suspended(&client->dev))
818 __ov2685_power_off(ov2685);
819 pm_runtime_set_suspended(&client->dev);
820
821 return 0;
822 }
823
824 #if IS_ENABLED(CONFIG_OF)
825 static const struct of_device_id ov2685_of_match[] = {
826 { .compatible = "ovti,ov2685" },
827 {},
828 };
829 MODULE_DEVICE_TABLE(of, ov2685_of_match);
830 #endif
831
832 static struct i2c_driver ov2685_i2c_driver = {
833 .driver = {
834 .name = "ov2685",
835 .pm = &ov2685_pm_ops,
836 .of_match_table = of_match_ptr(ov2685_of_match),
837 },
838 .probe = &ov2685_probe,
839 .remove = &ov2685_remove,
840 };
841
842 module_i2c_driver(ov2685_i2c_driver);
843
844 MODULE_DESCRIPTION("OmniVision ov2685 sensor driver");
845 MODULE_LICENSE("GPL v2");
846
